When shown on TV in the year 2010, this song was taken to the 12th day quickly by Dr. Doofenshmirtz saying "Just skip to the 12th day already!" This was done so Disney Channel or Disney XD could continue to their show.

Continuity

Dr. Doofenshmirtz mentions his love of almond brittle again.

Candace appears to grow more frustrated as she sings her line from the second day, two busted brothers, towards the end, most likely because she feels she may never get her wish.

Dr. Doofenshmirtz sings part of the song closer to its original version in "Phineas and Ferb Christmas Vacation!", The way he sang it as follows is, "And a Partridge on a Perry... the platypus!", which was very similar to the original, which goes, "And a Partridge on a Pear Tree". When he reaches the ninth day in the song, he sings the fifth day exactly how it traditionally is, saying that he had to do it at least once because he is "traditional".

Other versions

In the Philippines, the sketch comedy Goin' Bulilit has versions of the 12 Days of Christmas every year in the "last year's days."